We have a red Portuguese floor corker. The way the handle (peg) comes down on an angle is a flawed design. A straight down drop on the cork would eliminate a lot of problems. Looking for a new corker.
I have a Ferrari (Italian) corker and it also comes down at an angle, but I have not had any problems with this design.
I am only aware of straight down system with a double handled corker (do not recommend), or something like a Rapid 12 corker (but this corker is very expensive).